csky: add fenv support from glibcHEADmaster

1 files changed, 42 insertions, 0 deletions

diff --git a/libm/csky/fsetexcptflg.c b/libm/csky/fsetexcptflg.c
new file mode 100644
index 000000000..b6281d5c2
--- /dev/null
+++ b/libm/csky/fsetexcptflg.c
@@ -0,0 +1,42 @@
+/* Set floating-point environment exception handling.
+   Copyright (C) 2018-2025 Free Software Foundation, Inc.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library.  If not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#include <fenv.h>
+#include <fpu_control.h>
+#include "fenv_libc.h"
+
+int
+fesetexceptflag (const fexcept_t *flagp, int excepts)
+{
+  fpu_control_t temp;
+
+  /* Get the current exceptions.  */
+   _FPU_GETFPSR (temp);
+
+  /* Make sure the flags we want restored are legal.  */
+  excepts &= FE_ALL_EXCEPT;
+
+  /* Now clear the bits called for, and copy them in from flagp.  Note that
+     we ignore all non-flag bits from *flagp, so they don't matter.  */
+  temp = ((temp >> CAUSE_SHIFT) & ~excepts) | (*flagp & excepts);
+  temp = temp << CAUSE_SHIFT;
+
+  _FPU_SETFPSR (temp);
+
+  /* Success.  */
+  return 0;
+}